Perpetual calendars



Feb. 28, 1961 J. E. LEWIS PERPETUAL CALENDARS Filed May 31. 1960 3/\FIOI ff 2 l K q I* o /5 JANUARY /F FEBRUARY MARCH APRIL L SMTWTFSMTWTF'S SMTWTFS F n lI2 I|I2I3I4I5j ITI I I`I'I7 INVENTOR. f5? JAMES E.LEWIS mf d/M/ TORNEYS Feb. 28, 1961 J. E. LEwls PERPETUAL CALENDARS 5Sheets-Sheet 2 Filed May 31, 1960 illu-haii Ililllllillllllllll N .O u

Feb. 28, 1961 .1. E. LEWIS PERPETUAL CALENDARS 5 Sheets-Sheet 3 FiledMay 31, 1960 INVENTOR. JAMES E. LEWIS Feb. 28, 1961 1 E` LEWIS 2,972,827

PERPETUAL CALENDARS Filed May 3l, 1960 5 Sheets-Sheet 4 ZOE u? f zo mmmz m 202200 Feb. 28, 1961 J. E. LEWIS PERPETUAL CALENDARS 5 sneets-sheet5 Filed May 3l, 1960 mm @Om com INVENTOR. JAMES E. LEWIS ZM/4v ATTORNEYSv been inherentlyy subject to error byv reason of the compilifl'- UnitedStates Patent io 12 claims. (Cirio-114) This invention relates to .afcalendar, particularly a perpetual calendar ofthe kind adapted tosh'ow,the date of any day of any'selected year.V

Oftentimes -itis desiredto determiney particular information about acertain yeaiqor group of years. yFor xample, it may be important Vto beable tond lfthe. day 20 of the week for any date in a certain year. Asafurther examplev it may be desirable to determine all of the monthsbeginning on Sunday in a particular year.

Various systems and arrangements for 'a perpetual calendar haveheretofore beenY proposed. Thus, conrplex formulas have been derivedandy elaborate charts and the like have beenv developed in attempts toyprovide information of this sort. However?, the formulas, charts and*thelike lasA heretofore proposed havfg'en A riiredmaonplicad'inanipful'ation'I proeediirnfor each itemV of information obtained.-Conseoueny, hev

formulas," charts Vand thel likey heretoforel .proposed have had'limited utility, and theM information obltainedwhas I cated process*required` for extracting*ltheffinrormation. Moreover, the formulas,charts and the. like as yheretofore 'proposed oftentimes are;v validland accurate for only a certain span of years.l Y l It is therefore aprimary'objectofithe ,presentiinv tion toenable afcornplete calendar foranyl selected/year; to be vievved in its entirety at `ontertirne ltisfarelated, object to, showfsimultaneously 'the date forQall Aof. daysyQffanyA selected *year inra conventional. calendar, l. formula. i" .A v,A flt a ,furtherV objee fthe presentjinvent structa perpetual'calendarthat once set forfaqn Yyear is a leap yearor a common year.

O rice 2 viewingA apertures are substantially coextensive in length witha face on a rod and are', marked with .mont-h and day identifying data.Also, the viewing apertures are etfec- Y tive to permit onlyfone face orrod to be viewed in any one time. The rods are interconnected forrotation with one'another and in equal `angular yamounts about theirrespective longitudinal axes so that the rods can be rotated to enabledifferent combinations of rod faces, corresponding to different years,to be coordinately presented for view. The perpetual calendar of thepresent invention also includes mechanismfor selectively Arotating therods allocated to March through December one-V seventh of a completeturn with respect to the rods allocated to January and February to varythe starting dates of the months of March through December by one day tocompensate for leap years. 'fo set the calendar vincorporating thisheptagonal-faced rod arrangement for any selected year, the operatorYneed know vonly the day of thepweek, thatv the year `,starts on andWhether the y Y This latter information can be Ydirectly'obtained from achart listing this `information opposite a chronological arrangement vof years. With this information in mind the calendar can be set fortheselected year in a quite simplejmanner v merely by rotating the rodallocated tothe rst week inJanuary vto fpresentpthe proper face to viewat-the corresponding vievving apertures, and, if necessary, making aslight additionalkcornpensation for a leappyear setting.

` lrialsrnuehn'asr all ofthe remainingrodsof the fc'alendar to setsupthe complete calendar` for the vselected year. Moreover, oncethqcalendar isjinitially set for any-se' lecrted year, the calendar neednot be `reset to `determine any otherinformationfor the entireyear. It`isV another i object of the present invention to incrporatethe foregoingstructural features' effective tofunction inthe manner described inanovel.perpetuahcalendart-I It stillV a Afurtherv object fof-thepresent-,invention to incorporate a mechanismf .for visuallyv indicatingwhether a" leap year or a common year has been selected inY a perpetualcalendar. which incorporates the foregoing structural features. i

' Other and furtherobjects ,ofv the 'present invention rvivillbef'apparen't fromthe'` following` descriptionand claims andareillustrated in thel accompanying drawings which,

Ibyyvay of illustration, vshow fa preferred embodiment '-*II'n thedraiving y l.

, y rig; -1 :'igfpnn yie'mpariiailyfbiien aiiiy'mpn tos-how details" ofconstruction,of'a;perpetual calendar: v `constructed vinaccordan'cevwith one embodiment'of th`ef` f Y Fig: i is as'idefelevationvi-vv taken approximately g-Eiggk safgperspectiye. viewfillustrating a5-frame as-` each of which isaligned with a corresponda??@amasar Fig. 4 is an elevation view in section taken substantially alongthe line indicated by the arrows 4-4 in Fig. 1;

Fig. 5 is an elevation View taken substantially along the line indicatedby the arrows 5-5 in Fig. 4;

Fig. 6 `is a fragmentary elevation View in section taken substantiallyalong the line indicated by and in lthe direction of the arrows 6--6 inFig, 4;

Fig. 7 is a fragmentary elevation view in section taken substantiallyalong the `line'indicated vby and in the direction of arrows 7-7 in Fig.4;

Fig. 8 is a perspective view of a rod member iucorporated in thecalendar illustrated in Fig. 1; l

Fig. 9 is a view of a part of a chart which may be utilized inconjunction with the perpetual calendar illustrated in Fig. 1 todetermine the day of the AWeek on which any selected year starts as wellas whether the selectedyear is a common year or a leap year;

Fig. 10 is a chart showing the fourteen different conibinations of rodfaces for the calendar illustrated in Fig. l for any and all set-ups;V

Figs. ll-ZG are layout views of the different rods utilized in thecalendar illustrated in Fig. l; and

Fig. 21 is a somewhat schematic View of mechanism of visually indicatingwhether` a leap year or common year has been selected in the calendarillustrated in Fig.Y 1.

in Fig. l a perpetual calendar constructed 'in accordance with oneembodiment of the present invention is indicated generally by thereference numeral 31. in Vthis instance the calendar 31 is arranged topresent the twelve months of a year in a format of three groups of fourmonths each. Thus, January, February, March, and Aprilare alignedkhorizontally in the top group of months while May, lune, July, andAugust are includedy in the center ygroup and September, October,November, and

Eec'ember are includedk in the lower group. This format Y enables acompact mechanism to be obtained. However, as will become more-apparentfrom the description to follow, otherl formats can equally well `beutilized. Thus,

' by way of example, the twelve months of a year could yso 4 Y tures 39in the side rails 34 and 36. This construction enables pairs ofheptagonal-faced rod members as 48 and 49 (see Fig. 3), each of which ishalf as long as a rod member 41, to be mounted for rotation between theside rails 34 and 36. Thus, a rod member 49 is formed with a projectingstub 51 at' one end thereof and which is adapted to tit within anaperture 39 in the side rails 36. The opposite end of the rod member 49is formed with a circular bore 52. The rod member 48 is formed withaxially projecting stub shafts 53 and 54 at the opposite ends thereof.The stub shaft 53 is adapted to be received within an aperture 39 in theside rail 34 while the stub shaft 54 is adaptedto project through anaperture 47 in the center rail 46 and tit within the circular bore 52 ofthe rod member 49 to thereby support both of the rod members 48 and 49from the center rail 46.

The center rail 46 has been omitted in the broken away portion of Fig. 1to simplify and clarify the showing of a drive connection between tworod members 48' and 49 presently to be described.

The entire frame assembly 32 isadapted to nest Ywithin an open-topcontainer `56 which thus affords a protective and decorative exteriorfor the frame assembly 32.

The calendar 31 also includes a top-cover plate 57 which is positionedabove theframe assembly 32 and associated rod members' and which issuitably attached to the lower container 56 in any suitable manner.Thus, cap screws or like fastening devices, not illustrated in thedrawings, can ybe utilized for this purpose. The

A cover plate` 57 is formed with viewing apertures 6i) which are markedwith weekday identifying data and which are adapted to coact withcorresponding faces on the rod members 41, 48, and 49 to present to Viewnumerical 'calendar data carried on the faces of the rods .r inthemanner illustrated inl-"ig,` l and subsequently to be described ingreater detail herein'.v

plate 33 and a'pair of side rails 34 and 36 aiiited therefy i to. Theside rails 34and36 are Preferably removably secured to thebottomplatey33 in any suitable'manner such asrby screws or the like, andreinforcing angles 37. and 38 are attachedy to the respective siderrails j34 and rails with the bottom platel' Each side rail is lformedwith a plurality of equally spaced circularapefrtures 39 which arealigned withcor'responding apertures` 39 inthe opfposit'eside rail. Intheformof the invention illustrated in Figs. 1-3, each siderail isformedwitheighteeri such Thus aligned apertures 39 in the side railsv3.-evandf.y Center railll.` is additionally form'ed'with' apertures;

Each of the rod members 41, 48, and 49 is composed of individual rodslongitudinally aligned'with onea'nother, Thus, the rod member 41illustrated in Fig. 3 includes three individual rods, each designated bythe numeral 6 and a fourth 'rod 6A'. Likewise, the 'rods V'48, and 49illustrated in Fig.V Stare each composed of` two individual t rods,eachudesignated bythe numeral` 4. `1Anfaccordance with the presentinvention each ofthe Vtwelve rod mem;

- bers `41, s ixrod membersV 48 and six rodmembe'rs 49 is composed ofdijerent combinations of only Vten separate and distinctY rods, andthese rods are designated by the numerals 1-6, SA, 6A, 5B, and 46B inthe 'layout views of Figs.-11'20. lThe characteristics ofi theseindividual v.rods will be described `in greaterdetail hereinafter, but

at this-time it should be noted that the individual rods are to `beincorporated inthe rodmernbers as 41,v 48T, and 49 iii-a predeterminedkmanner whenever aisideJby-s'ide arrangementy of months ias illustratedin`Figldl'is to be 36 and the' bottom plate 33 at the .juncture oft'heside In *whatever arrangementy 'of'months is vto be utilized 'ina'perpetual calendar constructed'in accordancewith the present.invention; individual rods as `illustrated,fin'Figs.

*Il l-20 are" arranged'in groupscorresponding t'othe' twelve Y 'monthsof a year Vwith suliicien'tjrods ineach 'group 'for presenting allpossible-weeks in'"anygmonthiY '1`jliusj-and `'as' -isapparent from; aninspection oftFig'. 1; itjs possible.` to have days withinjsixVdifferent'weeks'in,the'montlifof`V `1 iiililiegfeim.ofdefensin@iiuseadiiifri side-byfsid'arrangementoff tional rod, rod 6B illustratedfin `,Fig.f2(v), which-al1 the faces of the rodv are blank,hasQbeen'i/ncluded for the month of February to facilitate'mechanicalconstruction of the calendar 31 as will becomeflmore apparent from thedescription to follow. j j l As noted hereinabove, respective Figs.ll-ZOV illustrate in layout view the individualvrods incorporated in thecalendar 31. In these figures the letters A-G arerfor descriptivereference only and' are notjineludedin an actual calendar mechanism.`rlfheLrelationship of the'rods shown in Figs. 11-20 will best beappreciated by vconi-A paring the rodsY illustrated in Figs. 115,29Ywith the per'` spective view of the. rod member 41j ustr'ated inl-iig.y8. Thus, the rod member 41 illustrated 11rlli`ig." 8)is'aY *.soli'd;one-piece member composed 'of four individual rods 1 each havingnumerically markedfaces `as killustrated'V in Fig. 13 of the drawings.Each r`o`d 1 in the'wrodA member 41 includes seven faces designatedbythe respectivereference numerals A-G in Fig. 13.1 In this instance therod member 41 provides the individual rods1j for the lirst weeks of eachof the months of May, June, July, .and August in the calendar 31`illustrated in Fig. 1. VFor the year 1960 face G ofthe rod lallocatedtothe irst yweek in May is presented to view in the Vaperture 60. Likewisethe face D of the rod `1 allocated tothe firstweek in-June is presentedto view, and the facesB andFv of the respective rods 1 allocated to thefirst weeks in the respective months July and August are presented toview.' A

v Each face of. each rod isvformed with seven 'divisions correspondingto the'seven days of a week and the given date numeral for each of theseven days of the weekis afforded by the'arrange'ment of the numerals inthe divisions of the respective 'faces Vof therods aswillbe apparentfrom an'v inspection of/Figs. ll through V2 0. Thus, by a Vproperselection ofthe individual rods andproper orientation of the'rods ineach Vmonth by group,.al1 of the ,numbered days in .a month can b eshownin `serial order' regardless' of the daylof 'theweekjon'which the 'monthstarts'. By way of example;'JanuaryA which has thirty-onekdays,lrequi'res` one each of then rods 1 through 6` illustrated in therespective' Figs.f 13l8. lffhesixjrods thus.allo cated toiJanuary are"initially orientated with respectrto one another "so that correspondingfaces of yeach of the rods are simultaneously presented for view at. theaperture 60 in the manner illustrated in Fig. 1. Each of themonths ofMarch, May, July, August, October, and December also have thirty-onedays and therefore require the same rods 1 through 6 as allocated to themonth of January. Thefmonths of April, June, September, and Novemberhave only thirty days. 1 For these months appropriate rods l5A and 6A,shown in respective Figs. llfandllZ, which arermarked for-a 30-day monthrather a 31-day month r`are associated with rods 1 through 4 illustratedin respective"Figs.,l3- 16. In the case of February which hastwentyeight days in a common year or twenty-nine days in a leapyeargrods 5B`and 6B as illustrated in Figs. 19 and 20 are associatedwith rods 1-4.` In the case of vrod 5B the` 29th day of February hasbeen designated by the reference character L rather than a numeral 29-to minimize any possible conflict with the first day vof Marchin thecase lof a common year; or non-leap year.` Also, and as notedhereinabove, since February cannot have more than tive weeks, allsevenfaces ofthe krod v6B are blank. f

A In `accordance with the rpresent' invention operating means@areincluded in thel calendar 31 'for rotating the Arods allocatedY tothe respective months in'-l unison vand. ink equal angularramounts abouttheir respective longiftudinal-axesto presentditerent combinations ofrod faces, corresponding to different years',-in viewingfposi-rstantially 51 degrees. A pin74 projects from the disk tion at theapertures 60 in the coverplate:57L:"Withfr jeferenceto the broken awayshowing'infFig.1 as .well aSrrFg-c 2, it fis. Seen'fth'at the;voperating.`means1finc1ude sprockets@ which, are suitably txcdaforrotatxpni with the rod members 41T @11549, as byfbeiag keyed onfthe'stub shafts'43 andr 51. A chain belt 67 is' engaged withr ltionof-anyone sprocket, as fby` knurledk'nob 68 (see Fig-l), iseifectiveftosrotate eachl ofthe other sprockets an equal amount.; Thus,each of the rod members 41 and 49, corresponding fto the months ofMarchthrough December, `are adapted .at all times to be rotated with oneanother in either direction of rotation.A Y

. The rod members 48, corresponding to the months of January andFebruary, are alsoconnected forrotation with therod members 41 vand 49and in equal angular amounts therewith. .Howeventhe means affording theconnection between therods allocated to the months of March and Aprilandthe months of January and Feb'- ruary; include valost-motion connectionwhich permits one-seventh of a turn ofrelative rotation between therods` allocated to the months of January and February andthe rodsallocated to the remaining months of the year ,to compensate for .leapyears `as will now be described.

With particular reference to Figs. 4-7, it is seen that the :above-notedlost-motion connection is afforded by a pin and slot constructionassociated with the rod members 48 and 49 which comprise the respectivero'ds 1 allocated to the first week in each of the months' of January,February, March and April. In this instance the adjacent ends of the rodmembers 48' yand 49" include disk members `71 and 72. The disk member71is formed with an arcuate slot 73 extending throughanangle Vof subimember 72 su'iiciently far to have the-free endthereof disposed withintheslot 73 so as to be engageable .with the end surfaces ofthe slots73.It willthus be` apparent from an inspection of Figs. 4-7 that, dependingupon the initial disposition of the pin 74 within the slot 73 and thedirection of rotation of the rod member 49,the,rod member 49 mayberotated one-seventh of a turnrelative tothe rod member 48` prior toproducing any rotationzof the rod member-48. l

yEach of `the remaining rod members 48,k which, are composed of theremaining rods allocated` to the respective months'of January andFebruary, are connected for rotation with the rod member 48 by a seriesof sprockets 76 and a linkV belt 77 similar to the sprockets 66 and linkbelt 67 described hereinabove with reference to the mechanism forrotating the rod members 41 with the Vrod members 49. v

The calendar 31' of the presentfinvention is adapted to be set for anyselected year by rotating the knurled knob 68 in a clockwise direction,as viewed from the right side of the calendar 31 illustrated in Fig. 1,to position. the proper face of the rod 1 allocated to the rst Week inJanuary at the viewing aperture 60. "Thus, for either a common year or-leap year the .knob 68 is rotated in the above noted clockwise`direction until' the numeral 'l Vl is positioned beneath the proper dayof the' week for the selected year.. Each of the `rods of the calendar31 is trained for rotationv withthe rod'1 allocated to the irst Week inJanuary through the sprocket and belt mechanism the month of Februaryhasone'extraday, thepstart'ing dates -of each off-the monthsof'lVarchto4 vApril'are'd'elayedfb'y one'day..rThef-lost-motion'lonnection atorded betweenv therods'--allocateduto`months "of January and February and the rodsallocated to the remaining months of the year enable the necessaryshifting of the numeral dates of the months of March through December tobe obtained.V That is, the one-seventh of a turn of relative rotationafforded by the pin and slot connection 74 and 73, described in detailhereinabove, enables each of the rods allocated to the months of Marchthrough December to be rotated one-seventh of a turn in acounterolockwise direction, as viewed from the right end of -thecalendar 31 illustrated in Fig. 1,. to shift the numeral dates for eachof the days in these months by one day to compensate for the extra dayincluded in the month of February in a leap year.

Thus, one additional combination of rod faces can be effected for eachof the above-noted seven combinations, so that a total of fourteendifferent combinations of rod faces at the viewing apertures 60 suflicefor any and all year set-ups. The fourteen possible combinations of rodfaces for rod 1 of each month have been charted in Fig. 1 0 wherein thecombination of rod faces corresponding to the leap year 1960 is set outin the line numbered 9. By comparing Figs. 1 and 10 it can be seen thatthe relative disposition of the rod faces-indicated in Fig. lcorresponds to that set out in line 9 of the chart in Fig. 10. Thus,once the individual rods have been initially oriented with respect toone another in the manner illustrated in Fig. 1 and connected forrotation in the manner described hereinabove, it is necessary to knowonly two facts to reset the calendar for any selected year. The day ofthe week that the year starts on must be known, and it must be knownwhether the year is a leap year or a common year. Both of these factorscan be read directly from a chart, as illustrated in Fig. 9, wherein thestarting date of the 'week of the year and the designation of the yearas a leap or a common year is positioned beside a chronological listingof years,

In brief summary the operation of the calendar 31 is as follows: thestarting date of the week of the particular year to be set on thecalendar 31 as well as the designation of the year as a common year or aleap year is determined, as by having reference to va chart like thatillustrated in Fig. 9.- The control knob 68V is rotated in a clockwisedirection as aforesaid to set the date January 1 in alignment with theproper day of the week. If the year is a common year no furthermanipulation of the calendar 31 is required, and the correct dates foreach day of the selected year are shown simultaneously in a conventionalweek-by-week calendar format. However, if the year is a leap year, thecontrol knob 68 is subsequently rotated one-seventh of a turn in acounter-clockwise direction as aforesaid to rotate the rods allocated tothe months of March through December oneseventh of a turn and therebyshift the numeral dates of each of the days of the months of Marchthrough December by one division to compensate for the extra day'and themonth of February while the settings for January and February remainundisturbed. After this slight adjustment of the calendar 31 tocompensate for the leap year, no further manipulation of the calendar 31is required. When it is thereafter desired to reset the calendar 31 forsome other year, the control knob 68 is again rotatedL in a clockwisedirection. In no case will it be necessary to rotate the control knob 68more than six-sevenths of a complete turn. The maximum amount ofrotation that is required of the control knob 68 is that necessary ktoreset the calendar for the next succeeding year, in which `case it isnecessary rto rotate the control knob 68 six-sevenths of `a turn.

,'Ihus, to reset the c alendarl from the set-up from the year 1960 tothe yset-up for the: year 1961, the knob 68 is rotated in a clockwisedirection six-sevenths of a turn. This has the eect ofrotating the rod 1allocated tothe first Week in January through ve-sevenths of a turnsince one-seventh of la turn of relative rotation betweenthe rods .1allocated tothe months of. March yand April and the rods 1 allocated tothe months of January and February is permitted by reason of thelost-motion connection therebetween prior to any rotation of the rods 1allocated to the rst weeks in January and February. Thus, face B of therod allocated to the first week in January is shifted from beneath theaperture 60 and the face G is shifted into View, as willbe apparent froman inspection of Fig. I3. The numeral 1 on theV face G of rod 1 isthereby positioned for the starting dayr of the week (Sunday) of theyear 1961. Inasmuch as the rod 1 allocated to the lirst week in March isrotated six-sevenths of a turn, face E is shifted from view and face Dis shifted into viewing position at the aperture 60. With reference toFig. 13 it will be noted that this is the proper face for the rst weekof March in the year 1961. The proper faces of each of the other rods ofthe calendar 31 are likewise positioned at the viewing apertures 60 bythe above-described clockwise rotation of the control knob 68.

In accordance with the present invention retaining means are preferablyincluded in the perpetual calendar 31 for retaining the calendar in anyselected yearly setup. With particular reference to Figs. 4-7 one formof retaining means is shown as including a spring-type latching detent81 of a V-shaped configuration in which the apex of the V is adapted toseat within complementary shaped notches 82 formed 'in the periphery ofthe disk member 71.

, Also, means are preferably included in the calendar 31 for visuallyindicating whethern the calendar is set up for a common year orfaleapyear. As illustrated in Fig. 1 the indicator means are designatedgenerally by the reference numeral 86 and include an arcuate-shapedcutout or window 87v formed n the cover plate 57 beneath which a pointer"88 is swingableto indicate either a leap year or a common year.

With particular reference to Fig. 21, one form ofa mechanism foraccomplishing swinging movement of the pointer 88 is illustrated. Thus,the outermost end portion of the rod member 49' is formed with externalthreads 89 of relatively high pitch and includes a washer 91 suitablyattached thereon as by a cap screw 92. The control knob 68 is movableaxially on the threads 89 in a direction dependent upon the direction ofrotation of the control knob. Thus, with a standard right-hand thread,rotation of the control knob 68 in a clockwise direction, in the courseof setting a common year in the manner described hereinabove, causes thecontrol knob 68 to move leftwardly and in a rapid manner by reason ofthe relatively high pitch of the threads 89, as viewed in Fig. 1,andiinto engagement with the shoulder aiorded at the inner end of thethreads 89. The pointer 88 is pivoted for rotation about a fulcrum 93,and a follower member. 94 is connected to the pointer 88 and biasedtoward engagement with' the control knob 68 as by a spring 96. Thus, theinclination of the pointer 88 is dependent upon the axial position ofthe control knob 68 on the threaded end 89 of the rod member 49, so thatrotation of the control knob 68 in a clockwise direction moves thepointer 88 to indicate a common year setting while rotation of thecontrol knob 68 in a counterclockwise direction, and outwardly on thethreads 89, enables the pointer 88 to swing to the leap yeardesignation.

Hence, whileI have illustrated and described the preferred embodiment ofmy invention, it is to be understood that this is capable of variationand modification,

Aand I therefore do not wish to be limited to the precise details lsetforth, but desire to avail myself of "such changes'and alterations asfall within the purview of the following claims.

I claim: f

1. A perpetual; calendar for simultaneously showing a complete calendarfor any selected year and comprisin'g'a plurality` of'.heptagonal-facedrods arranged 4'in groups corresponding"to'the'twelvemonths of a year, operating means for rotating ,the rods topresent toview different combinations Iof rod faces corresponding to diterentyears, and means affording'substantiallyy oneseventh ofi a turn ofrelative-rotation betweenjheirods allocated'to the months yofn.lanuary'and Februaryand therods allocated to then remaining monthsof'the year to compensate for leap years.

2. A perpetual calendar for simultaneously showing a complete calendarincluding the dates of all of the days of any selectedyear andcomprising a plurality of heptagonal-faced rods arranged in groupscorrespond ing to the twelve months of a year, operating meansinterconnecting the rods for rotation with one another and in equalangular amounts about their respective longitudinal axes to disposed oneface of each rod in-a predetermined angular dispositionV in the calendarand thereby enable diierent combinations of rod faces corresponding todiierent years to be coordinately presented for view, and meansaiordinga lost-motion connection between the rods allocated to the months ofJanuary,v

and February and the rods allocated to the remaining months of the yearfor enabling the rods allocated to to January and February to compensatefor leap years.'

3. A perpetual calendar for simultaneously showing a completecalendarincluding the dates of all of the days of any selected year andVcomprising 1a plurality u of heptagonal-faced rods arranged in groupscorrespond- .s ing to the twelve months of a year, operating meansinterconnecting the rods for rotation with one another and in equalangular'amounts about their respective longitudinal axes to place oneface vof each rod in a predetermined angular ldisposition in thecalendar and thereby 'enable diierent combinationsY of rod facescorresponding to diierent years to be coordinately presented for view,whereby seven different combinations of rod faces, corresponding to theseven days oi? a week on which a common year can start, can be obtained,andk means for compensating for leap years, said meansl c including alost-motion connection between 'the rods allocated to the months ofJanuary andrFebruary and the rods allocated to the remaining months oftheyear for enabling the rods allocated to March-throughDecember to berotated one-seventh of a complete turn with respect tothe rods allocatedVto lJanuary and kFebruary .I to'compensate for leap years, wherebyoneadditional .Y combination of rodjfaces can be effectedy for each'of ffourteen different combinations of yVrodffaces snilice 1.50

the above-noted seven combinations, l`so that a total of forany and allyearly set-ups.

' 4. A perpetual lcalendar lfor simultaneously/showing the dates of allof the daysof any selected year and comprising a Vplurality ofheptagonal-facedrodsA ar ranged in groupsV corresponding to* the; twelvemonths-tof a year, voperatingmeans interconnecting' the; rodsj for#rotation with one another and in equal angular amounts about theirrespective longitudinal axestfo position one face of each 'rod inapredetermined angularr` disposition in the calendar and v'thereby enabledifferent combinations of rod' facescorrespondi'ngto different yearstofbeV coordinately presented for view, lmeans for" comp'er'isatingv forleap years, said means including va lost-motionconnection affordingone-seventh of a complete turn ofgl vrelative rotation 'between' the,rods allocated toythe' Y y months of January and February 'and ,therodsv allocated to the remaining months ofthe year, and vvindicatormeans associated with said operating'fmeans for vvindic a'ting whetheracommon yearora leap year hasbe'enselected(` 'Y 5. vA perpetualvcalendar as deiinet-iyin clairn'4sin cluding -latchingmeans forretaining lthe calendar in`any selected set-up.

V6. A perpetual'eaieadrffor simultneas@ novitgfin.

essere aconventional weekfbyweek calendar format dates otY all of 'thedaysjof ,any selected year, said'perpetual-` calendar comprising aplurality of rods Aeach-` formed with seven longitudinallyextendingfaces divided in seven 6 divisions for the seven daysof .afweekand having refer? ence knumerals inupredeterrninedA onesr of Ysaiddivisions;l said rods beingarrangecl in groups corresponding to thetwelve months of a year with suiicient rods in each group for presentingall possible weeks in any month, cover 10 means for disclosing to viewall but one face of each rod,

said cover means having viewing apertures formed therein generallycoextensive in length with a face on a rod and marked with month and dayidentifying data, operating means for rotating the rods in unison equalangular amounts about their respective longitudinal axes to presentdiierent combinations of rod faces corrponding to different years inviewing position at said apertures, and compensating means forselectively rotating the rods allocated to March through Decemberone-seventh of a complete turn with respect to the rods allocated toJanuary `and February to vary the starting dates o-f-March throughDecember one day to compensate for leap years.

7. A perpetual calendar as dened in claim 6 wherein at least ve rods areallocated to February and six rods v `are allocated to each of the othermonths.

8. A perpetual calendar as defined in claim 6 wherein the rods arearranged to present the twelve months in a format ofthree verticallydisposed groupsA of months with four horizontally aligned months in eachgroup of Vmonths withV adjacent ends of rods allocatedk to given monthsin each four month group joined together except forr said lost-motionconnection between the rods allocated to March and February. Y

' 9. A calendar Vfor simultaneously showing the dates of 'all of thedays of any selected year and comprising a plul rality Vofheptagonal-faced rodsy arrangedv in groups corresponding to thetwelvemonths of a year, frame means Imounting the rods for rotationabout their longitudinal axes, operating means interconnecting the rodsfor 4rota- 40 tion with'on'e'another and in equal angular amounts abouttheir respective ylongitudinal axes to place one face of each rod in apredetermined angular disposition in the calendar and thereby enablediferentcombinations of rod faces corresponding -tordiffferent years tobe' coordinately presented Afor view, andv compensating meansforselectively rotating the rods allocated to March through Decemberone-,seventh of a complete-turn with respect to the rods I *allocatedvto vJanuary through February; to vary the startthe operating meansinclude sprocket and linkgbelt means interconnecting said rods forrotation with1one another.

"the 'compensating means include av pin andslot connec- ,55 tion betweenone Vof the rods allocated to March 'anda A corresponding'rod allocatedto February.

k 4 L `-112. A perpetual calendar for simultaneously showing thedatesjof all --of the days of any selected year,v 'said perpetualcalendar comprising a plurality of rods each -m'eans` having viewingapertures formed thereinfgenerallyly oextensiveY in length Ywith 'agfaceon ja v rod fandj marked withmonth'and day identifyingdatay-PQI-atingmeans ing 'dates ofV March throughzDecember one 'day tocoml 1l.V Al perpetual calendar as sdened in claim 9v wherein t 60'formed with Vseven longitudinally extending faces divided "iinseve'ndivisions-for theseven 'days of a week and hav- A ingV referencenumerals :formedin predetermined ronresof.

* -said "divisions, said. rods `being arrangedfin'v'groupscorgresponding tothe twelvemonths ofsalfyearV with seient t rods'ineachjgroupfm presentingaall possible'weeks .in,'- v

anyrnonth, framenneansmounting'said'rodsfforfrotation' fin,saidhca'lendar and eiective'to align-oneface'c'ifffe'ach I l,

"f frodfin' substantially a common lplane,aover'means for dis-lf3'closing' to view onlyfsaid'onefa'c'e, ofeachfrodsafid cover (forrotating thejzrods infunirson.' equal'angulaizzaniountf` 75 abouttheirrespective Vlongitudinal agres'toipresent;

ferent combinations of rodofaees. corresponding to different years in*viewing position at said apertures, and compensating means forselectively rotating the rods allocated to. March through Decemberone-seventh of, a compiete.

References Citedinthe v'iileof this patent turnwith respect to the rodsallocated to I anuarfy through 5v 2,575,929

February to `vary the starting dates oi March through Deember one day tocompensate fon leap years.

UNITED STATES lPATENTS

